著者

太田 健一郎

出版者

Japan Society of Corrosion Engineering

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.33, no.5, pp.297-298, 1984-05-15 (Released:2009-10-30)

参考文献数

3

著者

能登谷 武紀

出版者

Japan Society of Corrosion Engineering

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.27, no.12, pp.661-670, 1978-12-15 (Released:2009-10-30)

参考文献数

130

被引用文献数

17 15

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This article is a review of recent literature on corrosion inhibitors for copper and copper alloys. Inhibitors are divided into two categories; (i) inorganic inhibitors, such as chromates, phosphates, and ferrous ions and (ii) organic inhibitors which include heterocyclic organic compounds, i. e., benzotriazole (BTA) and mercaptobenzothiazole (MBT) and their relative compounds. At present these are the most effective and widely used inhibitors in a variety of systems. The BTA derivatives such as tolyltriazole (TTA) and benzotriazole carboxylic acid will be the most promising inhibitors for copper and copper alloys. It is suggested that dimercaptothiadiazole (DMTDA) and triazinedithiol (TDT) and its derivatives may be used as a substitute of BTA. Effectiveness of both DMTDA and TDT is found to be better than BTA in some corrosive environments. Significant role of oxide films present on the metal surfaces is stressed in order to clarify the mechanism of protection performance of inhibitors. Long chain thio-compounds as film forming inhibitors are also described

著者

北村 義治 伊藤 順一

出版者

Japan Society of Corrosion Engineering

雑誌

防蝕技術 (ISSN:00109355)

巻号頁・発行日

vol.13, no.6, pp.256-261, 1964-06-15 (Released:2009-11-25)

参考文献数

3

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The corrosion of austenitic stainless steels and titanium in the aqueous solutions of several amino acid and their salts was investigated. The total immersion tests, the cell voltage-current curve method and the potentiostatic polarization curve method were adopted.The following experimental results were obtained: The aqueous solutions of acidic amino acids such as glutamic acid or homocysteic acid were comparatively corrosive, while neutral and basic amino acids scarcely; the corrosive behaviors of acid and basic salts of various amino acids bore some resemblance to those of acids and bases which were estimated to be freed from the salts.It is suggested that amino acids, which form salts with acids or bases, might have some neutralizing action on them, resulting in reduction in the corrosive effects of these salt solutions.

著者

鶴田 孝雄

出版者

Japan Society of Corrosion Engineering

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.34, no.2, pp.135-139, 1985-02-15 (Released:2009-10-30)

参考文献数

28

被引用文献数

3 4

---

Recent advances in the understanding of thermodynamic properties of aqueous electrolyte solutions at elevated temperatures, which is needed to calculate pH, are briefly reviewed, and examples of pH measurements at elevated temperatures are described.

著者

佐藤 教男

出版者

Japan Society of Corrosion Engineering

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.39, no.9, pp.495-511, 1990-09-15 (Released:2009-10-30)

参考文献数

55

被引用文献数

4 3

---

A review is given of some simplified concepts that will contribute to a better understanding of corrosion fundamentals. The corrosion process involves not only electrochemical reactions but also acid-base reactions, and it is the acid-base nature that diversifies the corrosion phenomena. Anions either catalyze or inhibit the anodic metal dissolution, and the passivation will result from the hydroxide-catalyzed mechanism of metal dissolution. Corrosion precipitates frequently control the selective mass transport in corrosion processes. Anion-selective precipitates accelerate and cation-selective precipitates decelerate corrosion propagation. A bipolar precipitate film, if anodically polarized, undergoes deprotonation and turns into a passive film. The electrochemical stability of passivated metals is determined by the electron energy band structure of the passive film. The passive film of n-type semiconducting oxides appears electrochemically more stable than the passive film of p-type semiconducting oxides.

著者

福谷 英二

出版者

Japan Society of Corrosion Engineering

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.27, no.3, pp.131-137, 1978-03-15 (Released:2009-10-30)

参考文献数

17

---

A brief review of the technical literature shows that numerous investigations have been made on alternating stray current electrolytic corrosion of lead, iron, copper, alminum and other metals.Alternating current corrosion on lead, iron and copper seems to be caused mainey during the anodic half cycle, but alternating current corrosion on alminum may be caused during both anodic and cathodic cycles.Alternating current corrosion may be also caused by the rectification effects of corrosion product film and or polarization.Weight loss effect of alternating current on lead, iron and copper is less than 2 percents compared with the effect of equal direct current, but its effect on alminum is very high and more than 40 percents of equal direct current.The effective remedial measures of alternating current corrosion are selective drainage method and cathodic protection by galvanic anodes.

著者

鳥越 泰 市野 隆英 中野 昌信

出版者

社団法人 腐食防食協会

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.28, no.6, pp.343-347, 1979

被引用文献数

2

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In view of increasing trend of applying water cooling to electric machines, investigation has been made on corrosion of the copper pipe that is comprised in the internally water cooled power cable. Practical tests on corrosion of the copper pipe by flowing pure water were carried out using actual power cable under practical use conditions with regard to conductivity, temperature, and oxygen content of water, and flow velocity. The ranges of flow velocity were chosen to be much wider than could be encountered in the actual cooling system. Corrosion quantity of the copper pipe was determined from analyzed data on ion exchange resin and filter. The result of two times corrosion tests made about one year, in state where water temperature are below 80°C and flow velocity are below 3m/s, are as fellows. (1) Corrosion rate of the copper pipe reached 2μ/year, but the traces of pitting corrosion was not detected. (2) By electrolytic reduction, predominant component of black corrosion products on the copper pipe surface was identified with CuO. (3) Corrosion products were found to have considerable effect on stifling corrosion rate.

著者

出雲 茂人 末吉 秀一 北村 一弘 大園 義久

出版者

Japan Society of Corrosion Engineering

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.39, no.5, pp.247-253, 1990-05-15 (Released:2009-10-30)

参考文献数

6

被引用文献数

3 10

---

In order to make clear the effect of volcanic environment on the corrosion of metals, corrosion tests where heating and cooling are repeated between 40°C and 20°C in SO2 gas atmosphere (150-200ppm) were carried out on the specimens, carbon steel (SS 41), copper, aluminium, and zinc-plated steel which were covered with volcanic ash on the surfaces. The corrosion phenomena were investigated by means of the measurement of mass loss for corrosion and electron probe microanalysis. For SS 41, aluminium, and zinc-plated steel, the corrosion is greatly accelerated by volcanic ash when it accumulate thick on the surface. The copper specimen corrodes faster in the case of no volcanic ash, while under the presence of volcanic ash the corrosion is greatly accelerated as volcanic ash layer becomes thicker. These effects of volcanic ash on the corrosion are attributed to capillary condensation and water-retaining effects of volcanic ash layer.

著者

竹本 幹男

出版者

Japan Society of Corrosion Engineering

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.35, no.2, pp.75-82, 1986-02-15 (Released:2009-10-30)

参考文献数

15

---

Utilizing a combined loading Stress Corrosion Cracking (SCC) test apparatus, SCC threshold stress criteria of two material-environment systems where environmentally assisted passive films are formed has been studied. Two systems studied in this report are SCC of carbon steel in boiling nitrate solution (60%Ca(NO3)2+3%NH3NO4) and SCC of 70/30 brass in Mattsson's solution (ammonical solution) at room temperature.The test results obtained are summarized as follows:1) The threshold stress of nitrate SCC of carbon steel could be well explained by the maximum principal stress theory although the elastic fiailure of substrate metal was ruled by the shear strain energy theory. The environmentally assisted passive film of this system is supposed to be thich magnetite, and so brittle that it could suffer brittle fracture at lower stresses than the yield stress of substrate metal. Intergranular cracks might inititate at the fractured passive film along the grainboundaries oriented in perpendicular to the maximum principal tensile stress.2) SCC threshold stress of 70/30 bass in Mattsson's solution was in good agreement with the maximum principal stress theory. The SCC threshold stress is much lower than the elastic failure stress of substrate metal. The tarnished film of this system is supposed to have an elastic modulas higher than that of substrate metal. and fracture stress lower than the yield strength of film-free substrate metal.3) Based on the test results of previous and this reports, it was concluded, that the SCC threshold stress of the systems which developed an environmentally assisted film could be ruled by the maximum principal stress theory, and that the SCC threshold stress of metals which had a selfhealing ability of passive film in atmosphere could be ruled by the strain energy theory which is similar to the elastic failure stress criteria of substrate metal. Whether the threshold stress of APC-type SCC is evaluated by the strain energy theory or maximum principal stress theory seems to depend on the mechanical characteristics of passive film in a given system.

著者

J. Flis J. Mieluch M. Smialowski 大塚 陸郎

出版者

Japan Society of Corrosion Engineering

雑誌

防蝕技術 (ISSN:00109355)

巻号頁・発行日

vol.14, no.7, pp.319-323, 1965-07-15 (Released:2009-11-25)

参考文献数

12

著者

P. L. Anthony O. M. Brown 福谷 英二

出版者

Japan Society of Corrosion Engineering

雑誌

防蝕技術 (ISSN:00109355)

巻号頁・発行日

vol.14, no.9, pp.412-417, 1965-09-15 (Released:2009-11-25)

参考文献数

4

著者

三沢 俊平

出版者

Japan Society of Corrosion Engineering

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.32, no.11, pp.657-667, 1983-11-15 (Released:2009-10-30)

参考文献数

80

被引用文献数

13 26

著者

高橋 樟彦

出版者

Japan Society of Corrosion Engineering

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.23, no.11, pp.557-572, 1974-11-15 (Released:2009-10-30)

参考文献数

83

被引用文献数

1

著者

D. Schlain C. B. Kenahan 大塚 陸郎

出版者

Japan Society of Corrosion Engineering

雑誌

防蝕技術 (ISSN:00109355)

巻号頁・発行日

vol.8, no.6, pp.260-263, 1959-06-25 (Released:2009-11-25)

参考文献数

7

著者

福井 三郎 川野 進 永江 康雄

出版者

Japan Society of Corrosion Engineering

雑誌

防蝕技術 (ISSN:00109355)

巻号頁・発行日

vol.11, no.5, pp.198-201, 1962-05-15 (Released:2009-11-25)

参考文献数

9

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During the acid cleaning of various equipments, one of the troubles frequently encountered is acid attack on construction materials. Therefore, care should be taken to protect the equipment from acid attack during acid cleaning.Although the acid attack on steel has been studied for many years, there seems to be very little study concerning the acid attack on copper alloys, because the corrosion rates of copper alloys are considered to be comparatively low in the non-oxidizing acid solutions such as hydrochloric acid.However, the acid solution containing oxidizing agents such as oxygen, ferric or cupric ion, etc. may cause attack.In this study, we have investigated the effects of acid concentration, temperature, gas atmosphere and oxidizing ions such as ferric or cupric ion on the corrosion of copper alloys in hydrochloric acid solutions.As a result, it has been found that in the presence of oxidizing ions, the inhibition effect of inhibitors is markedly decreased, and the corrosion rates of copper alloys are greatly accelerated in the inhibited hydrochloric acid solution.The tendency is more remarkable when air is bubbled through the solution.On the hand, in the absence of oxidizing ions, the corrosion of copper alloys in hydrochloric acid can be prevented by inhibitors even when air is bubbled through the solution.

著者

田島 栄 森 健実 小宮 衛

出版者

Japan Society of Corrosion Engineering

雑誌

防蝕技術 (ISSN:00109355)

巻号頁・発行日

vol.14, no.3, pp.109-117, 1965-03-15 (Released:2009-11-25)

参考文献数

12

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Contact corrosion of couples of aluminum-mild steel, aluminum-stainless steel, anodized aluminummild steel, and anodized aluminum-stainless steel was studied. Corrosion current, weight loss, polarization measurement and salt spray test were carried out on these couples in various inorganic corrosive media: 1N NaCl, 0.1N NaCl, 1N CaCl2, 0.1N CaCl2, 1N Na2SO4, satd. Ca(OH)2 (pH=12.5), 0.38N Na2CO3, 0.5N Na2CO3, 0.1N NaCl, 0.069N NH4OH, 0.09N H2SO4, 0.1N HCl.Under various experimental conditions, both aluminum and anodized aluminum were in general less noble than mild steel and stainless steel except in sodium sulfate and sulfuric acid solutions, in which mild steel was anodic against aluminum and anodized aluminum.In most of the experimental conditions, aluminum and anodized aluminum sacrificially protected mild steel and stainless steel from corrosion completely. Weight loss of aluminum was, however, much greater than that of anodized aluminum. Corrosion current by the aluminum-mild steel and aluminum-stainless steel couples in alkaline solutions was about ten to one hundred times larger than in neutral solutions, while, in the case of anodized aluminum-mild steel and anodized aluminum-stainless steel couples, except in neutral and acidic solutions containing Cl ion, only a small corrosion current was measured.

著者

大石 不二夫

出版者

Japan Society of Corrosion Engineering

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.38, no.11, pp.599-607, 1989-11-15 (Released:2009-10-30)

参考文献数

10

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Survey of durability and its evaluation of polymeric materials are presented, by introducing the authors studies.Articles are shown as follows. 1) Differences between corrosion of metals and degradation of polymeric materials. 2) Concept on material system. 3) Development of testing apparatus for evaluating dynamic durability of plastics. 4) Factors affecting durability of polymeric materials. 5) Trials for simulation of durability. 6) Development of C-type method for estimating life against environmental stress cracking (crazing) of plastics.

著者

岡野 一良 北村 義治 高橋 礼治

出版者

Japan Society of Corrosion Engineering

雑誌

防蝕技術 (ISSN:00109355)

巻号頁・発行日

vol.4, no.1, pp.27-30, 1955

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An U-fin heater used as an air heater for drying powder materials was damaged due to corrosion of the heating copper tubes. As the results of experiments, it was concluded that the corrosion was caused by the adhesion of solder to inner surface of the copper tube. In order to remove the solder, some methods both by chemicals and by electrolysis were examined. Although we have not yet found a method, which removes the solder completely and not affects copper tubes, we obtained some promising method, especially one by chemicals.

著者

上田 龍二

出版者

Japan Society of Corrosion Engineering

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.38, no.4, pp.231-237, 1989-04-15 (Released:2009-10-30)

参考文献数

10

被引用文献数

2 6

---

The photochemical machining of metals using a ferric chloride etchant is useful for producing micro machining parts and electronic parts such as printed circuit boards, shadow masks for CRT devices, IC lead frames etc. This paper presents the outlines of their examples of products, photo etching processes, photoresist materials for etch mask, machining accuracy, etchant composition, etching mechanism and characteristic phenomena.

著者

木島 茂

出版者

Japan Society of Corrosion Engineering

雑誌

防蝕技術 (ISSN:00109355)

巻号頁・発行日

vol.17, no.9, pp.381-388, 1968-09-15 (Released:2009-11-25)

参考文献数

24

被引用文献数

7 1

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Arrhenius plots were made using data on uniaxially stressed specimens of Types 304, 303 Se, 201, and 431 stainless steels immersed in 35% MgCl2 solution at various temperatures, pH of which had been adjusted to 3 at 22°C by adding HCl. The reciprocal of time-to-failure was taken as the rate of stress-corrosion cracking. Although this is not exactly correct, the results were in good agreement with the Arrhenius' equation. Furthermore, it was found that both the activation energy and logarithm of the rate coefficient, i. e. the pre-exponential term, increased in direct proportion to the stress-level applied and, in addition, the lines illustrating the above relations breaked at a stress-level corresponding to 0.03% proof yield strength of Types 304 and 303 Se steels. As for the other steels such a break was not evidently observed.Arrhenius' equation describes only the temperature dependence of a reaction rate and does not include the entropy changes, so that the activation energy corresponds to the activation enthalpy. Thus, the stress-dependent term, associated with the rate coefficient but not with the enthalpy, should belong either to the entropy term, if it depends on stress, or to another rate coefficient of the probability expression in terms of the free energy, if it does not depend on stress.The analysis of the results leads to the following conclusions: (1) if stress influences entropy, applied stress effectively decreases the activation free energy, and on the other hand the activation enthalpy increases with increasing stress; (2) if the entropy does not depend on stress, applied stress extraordinarily increases the frequency factor that depends on stress. This would mean that the density of active sites is augmented to very high order. Both the activation enthalpy and free energy increase with increasing stress.In both cases, therefore, rate of stress-corrosion cracking increases with applied stress. It can not be made clear, however, on the basis of this kind of analysis, which view is true, and, furthermore, there would be a case in which stress could influence both the entropy and the frequency terms simultaneously. At present, one can only say that the stress-dependent term, associated with thermal excitement of atoms but not with potential energy, is a sort of environment-sensitive parameter that may be able to control the susceptibility to stress-corrosion cracking, although the detailed mechanism involved can not be clarified.